Method of manufacturing stator core of electric rotating...

Details Method of manufacturing stator core of electric rotating... Method of manufacturing stator core of electric rotating...

2008-09-22

2011-11-22

Trinh, Minh (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S605000, C072S136000

Reexamination Certificate

active

08061015

ABSTRACT:
In a method of manufacturing a stator core of an electric rotating machine, a cylindrical laminated core is formed by thinning a side portion of a steel plate with magnetic pole teeth and helically winding the steel sheet, and the stator core is manufactured by performing ironing for the laminated core. This laminated core has steel sheets aligned along the axial direction thereof, and the sheets have respective thinned outer end portions spaced apart from one another on the outer side of the laminated core. In the ironing, the thinned outer end portions of the steel sheets are brought into contact with one another in a forming apparatus, and an ironing load is given to the thinned outer end portions to shorten lengths of the thinned outer end portions in the radial direction of the laminated core at a predetermined value.

REFERENCES:
patent: 4445353 (1984-05-01), Taleff et al.
patent: 6308549 (2001-10-01), Tokizawa et al.
patent: 7698803 (2010-04-01), Mitsui et al.
patent: A-62-290335 (1987-12-01), None
patent: A-2005-185014 (2005-07-01), None
patent: A-2006-246586 (2006-09-01), None
Notification of Reasons for Rejection, Japanese Patent Application No. 2007-244803, dated Sep. 15, 2009 (with English translation of the Official Communication).

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